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Bird Flu Viruses Raise Mounting Concerns Among Scientists

Researchers are not just worried about the virus popping up on American farms. Other types are causing trouble around the world.

© Tim Gruber for The New York Times

The milking parlor of a Wisconsin dairy farm. The Agriculture Department announced the first detection of bird flu in a herd in the state, the third time the virus had jumped from wildlife into dairy cattle last year.
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